Improvement in sliding-door sheave



UNITED STATES PATENT OEEIeE.

MARK L. DEERING, OF NEW YORK, N. Y.

IMPROVEMENT IN SLIDING-DOR SHEAVE.

Specification forming part of Letters Patent No. 90,345, dated- May 25,1869.

To all to whom these presents shall come, greeting.'

Beit known that I, MARK L. DEERING, of the city of New York, in thecounty and State of New York, the individual mentioned in and Whosenameis subscribed to the petition in this case, have, since the date ofthe application for Letters Patent referred to in said petition, madecertain improvements on my invention therein referred to and do declarethe following to be a correct description thereof, reference being hadto the annexed drawings or diagrams, representing the same, in Which-Figures l and 2 are front sectional elevations, and Fig. 3 is ahorizontal transverse view, Fig. 4 being a transverse view of a groovedroller necessary to complete the improvement I desire to add to my saidinvention.

The nature of my said improvement oonsists in providing the sliding-doorsheave invented by me, as aforesaid, with grooved rollers, tting intothe frame Within the casing of the sheave, and placing them in such aposition that the axle ofl the pulley upon the doei-slides strikes therollers at certain points on their peripherie-s, and thereby greatlyreduces the friction (consequent upon the constant sliding back andforth of the door) of the bearin gs, and lessens the Wear and tear ofthe axle of the pulley aforesaid, at the same time enabling the door tobe slid `back and forth with greater ease andwith less liability ofderangcment of the machinery constituting the sheave.

To enable others skilled in the art to make, use, and apply myimprovement to my said invention, I will proceed to describe itsconstruction, application, and operation.

I I, Fig. l, are grooved rollers, the frame A A having its sides fittedinto the grooves of the roller in such a manner that the rollers cannotget out of place. G is the axle of the sheave D, inserted in frame A A.'

When the sheave is in its place in the door, and the Weight of the doorrests upon the sheave D, the axle Gr is brought in contact with thefriction-rollers I I in such a manner that each edge or surface of thefriction-rollers forms a bearing, in which said axle revolves as thepulley revolves, but not much less friction than if the bearing oftheaxle were in the ordinary form in the frame A A.

I construct my frame and sheave-case in any of the known forms, andapply the rollers I I for the purpose of reducing the friction intraversing the door on the track, and for the purpose of greatlyreducing the possibility of the sheave getting out of repair, and ofenabling a sliding door, with my invention and improvement attached toit, to be the more easily moved backward or forward.

What I claim as my invention, and claim Letters Patent of the UnitedStates for, as an improvement on my patent passed Septem ber 8, 1868, insliding-door sheaves, is-

The arrangement and application of the friction-rollers I I, incombination with the sheave D and shaft G, frames A and E, and slides H,as shown and described, for the purpose described.

MARK L. DEERING.

Witnesses: J osEPH J. MARRIN, GEORGE WORKMAN.

